“What is important is we highlighted the process, which other clubs that have gone into Europe in the last couple of weeks I think are now more conscious of, because I think for everybody it wasn’t so clear for all that night.

“There is going to be a point actually where that will have to be reviewed because we went to a point and I think if that happens a few times, people are going to say: ‘Well, hang on a minute!’.

“But there are so many strands to those evenings in terms of the types of people that came into the game and left.”

England’s match against Bulgaria was stopped in the 28th minute and the first step of UEFA’s anti-racism protocol – a public address announcement calling on the abuse to stop – was enacted.

The abuse continued and Croatian referee Ivan Bebek halted the match again just before half-time, though it was later confirmed that this did not constitute the second step of the protocol under which the referee leads the teams from the field temporarily.

Monkey chanting and booing directed at England’s players and staff could still be heard during the second half, but the match was completed.

Southgate said: “It’s so complicated, having been involved in it now and stood on the touchline and have to make the decision when you’re asked.